2. O. Edwardsii, Crotch, (tab.'l, fig. 3 ) —Resembles Dejeanii, but is with- 

 out the fovea?, much smoother. Length 14—18 mm. 



Habitat. — Lake Tahoe, Cal. June, August. 



Crotch, Trans. Am. Ent. Soc, v, p. 73; H. Edwards, 1. c. 



3. O. Audouiilii, Reiche, (tab. 1 , fig. 4 ) — The thorax less deeply wrinkled, 

 the disc and apical margin nearly smooth, and the punctures of the elytra more un- 

 equal. Length 13 — 18 mm. 



Habitat. — Foot-hills and mountains of California, Oregon, Wash- 

 ington Territory and Vane. Island. June to August. 



Reiche, Ann. Fr., 1838, p. 300, tab. 10, fig. 2 ; Thorns. Mon., figs. 7, 8 ; Lee, P. R. R. Exp., 

 p. 27; H. Edwards, I.e. 



4. O. sub met alliens, Horn, (tab. 1, fig. 5.)— A species very distinct by 

 its bronze color, its more elongate and cylindrical form, and the shape of the elytra. 

 Length 13.5 mm. 



Habitat. — Eldorado Co., Cal. June. 



Horn, Trans. Am. Ent. Soc., 1872, p.; Hy. Edwards, 1. c. 



5. O. Hornii, Lee, (tab. I, fig. 6.)— Has the thorax less narrowed behind 

 than any other species, elytra rather broadly ovate, much rounded at the sides. 

 Length 16.5 mm. 



Habitat. — Yosemite, Cal. 



Lee, Trans. Am. Ent. Soc., v, p. 157; Hy. Edwards, 1. c. 



6. O. californicus, Eschh, (tab. 1, fig. 7.)— Has the thorax very deeply 

 rugose, which looks therefore more opaque, and may by this character be easily dis- 

 tinguished. Length 14 — 16 mm. 



Habitat. — California, west of Sierra Nevada, southwards to 

 Monterey Co. Found near San Francisco by Hy. Edwards. April 

 to May. 



Eschh., Atl. i, p. 4, tab. 4, fig. 1 ; Thorns., 1. c, p. 16, table 3. figs. 5, 6; Lacordaire, Gen. 

 Atl. i, tab. 1, fig. 1 ; Lee., P. R. R., p. 27 ; Hy. Edwards, 1. c. 



7. O. sequoia rum, Crotch, (tab. 1, fig. 8.)— Closely allied to californicus, 

 but longer, broader and stouter; eides of thorax more rounded; elytra broader and 

 more convex. Length, 18 mm. 



Habitat. — Sierra Nevada near Calaveras, Cal. June to August. 



Crotch, Trans. Am. Ent. Soc, v, p. 73. 



8. O. Lecoutei, Horn, (tab. 1, fig. 9 ) — Easily known by the form of the 

 elytra, having the greatest width in front of the middle, and behind this point be- 

 coming gradually narrower and less arcuate. Length 1 6 mm. 



Habitat. — Near Monterey, also Mariposa, Cal. June, July. 



Horn, Trans. Am. Ent. Soc., iv, p. 143. 



